A 3 pull later in the earth wing would be okay, and if it was 2 of the rapeface rock elementals and 1 of the memblur guys it would probably be about right for lower thaz. The combination of 3 rock elementals + 5 linked whitecons right behind you + another roaming rock elemental add if you get more than 5 feet from the wall is just dumb though.
There are only 2 types of Thaz raid encounters, "Very Easy" and "Very-Very Easy".